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Metal-Free Photocatalysts C₃N₃S₃ and its Polymers: Solubility in Water and Application in Benzylic Alcohols Oxidation Under Visible Light

Department of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Fuzhou University, Fuzhou, 350108, P. R. China

Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, P. R. China

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Lulu Zhao

Department of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Fuzhou University, Fuzhou, 350108, P. R. China

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Jie Xu

Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, P. R. China

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Jinlin Long

Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, P. R. China

E-mail Address: jllong@fzu.edu.cn

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, and

Linxi Hou

Department of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Fuzhou University, Fuzhou, 350108, P. R. China

E-mail Address: lxhou@fzu.edu.cn

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https://doi.org/10.1142/S1793292017501016Cited by:4 (Source: Crossref)

Abstract

Metal-free photocatalysts trithiocyanuric acid (C₃N₃S $_{3})$ and its polymers were one-step synthesized and used for selective aerobic oxidation of benzyl alcohol under visible light. The S–S bridged C₃N₃S₃ polymers showed higher oxidation activity with increasing polymerization time and reached a maximum at 40h. As a major factor, catalysts’ solubility in water at different temperatures (from 298.15K to 368.15K) was measured at atmospheric pressure. The obtained data were correlated by polynomial empirical equation and modified Apelblat equation, respectively. Experimental results proved that the solubility of C₃N₃S₃ and its polymers increased with increasing temperature. The solubility of C₃N₃S₃ polymers with lower polymerization degree (DP) were better than that of parent C₃N₃S₃ owing to the hydrophilicity caused by a low symmetry and disorder structure, whereas the higher DP could lead to the decrease of polymer solubility and further affect the photocatalytic activity. Thermodynamic properties of the solution system including the enthalpy ( $Δ H_{S}^{0})$ and heat capacity ( $c_{p}^{0}$ ) were calculated by the modified Apelblat equation.

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